<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<font size="7"> 你好这个世界</font>，
<font size="4" color="red">我很热情</font>，
<font size="2" color="blue">我还在犹豫</font>
</body>
</html>